Question

3х -10 y =-70 4х +9y = 63

Answer 1

Answer:

(0,7)

Step-by-step explanation:

(I'm assuming you have to solve the system of equations)

3x -10y = -70

4x +9y = 63

Solving by elimination.

Eliminate x first, so we need the x-component of both equations to have the same number but opposite sign. So i'm going to multiply the first by -4 and the second by +3.

//I could have also done +3 to first and -4 to second

-4(3x -10y = -70)

3(4x +9y = 63)

-12x +40y = 280

12x +27y = 189

Add the equations //x's cancel

67y = 469

Divide both side by 67, y=7

Plug in y into any original equation to solve to x

3x - 10(7) = -70

3x -70 = -70

3x = 0

x=0