Here's the question you clicked on:
nicole10
true or false? In order to solve a system of equation by substitution, you MUST always solve for y in one of the equations and hen back-substitute
because for example if you have to unknowns and two equations, ex: y=x+5 and the other says x=y-6.....then you would have to back substitue the y=x+5 into the value for y in the second equation.
|dw:1330406766557:dw|
then just solve for x
thank you i understand now
|dw:1330406799210:dw|
true or false? the x-intercept of the line with equation -3x+2y=5 is (-5/3,0)
because to find the x intercept you have to set the y intercept to 0
The previous problem was False ... you can solve for x and back substitute also !
it doesn't matter for which variable you're solving
? if you have and equation with two unknows you wont be able to solve for x....for ex: y=x+5, solve for x? you cant
your gonna have to back substitute
for the second equation
how do you get -5/3 for x i am getting -5
|dw:1330407174168:dw|
and your y would be 0
in finding the y-intercept, assume that the value of x is zero, or vice versa. .
true or false? In order to solve a system of equation by substitution, you MUST always solve for y in one of the equations and hen back-substitute The answer is false. And as far as y=x+5 you can solver for x. getting x=y-5 You can solve for either x or y (assuming you have two equations with two unknowns x, and y. Choosing the one that is most convenient and then substitute the value found in the remaining unknown.
true or false? the x-intercept of the line with equation -3x+2y=5 is (-5/3,0) First put equation in the slope intercept form: You will get y=(3/2)x+5/2 The y intercept is 5/2