If 13 is 40 percent of a number, we can rewrite this to say 13 = 0.4x, where x is that "some number." 0.4 is just 40 percent, since it is "40 parts out of 100 parts." Dividing each side by 4, we get 13/4 = 0.1x. Multiplying each side by 10, we get 130/4 = x. Dividing 130 by 4, we get 32.5 as our answer.
3/5x + 22 = 28
-22. -22
3/5x = 6
(5/3)(3/5)x = 6 × (5/3) multiply by the reciprocal
x = 6 × (5/3) -------------> 6 and 3 can be simplify so it will be x = 2 × 5 = 10
check
3/5 (10) + 22 ---> 3 × 2 + 22
28 = 28 ✔
4. would be B because the y column is being multiplied by 1.5
Answer:
a. 3/2.
b. (0, 2).
Step-by-step explanation:
a. 2y = 3x + 4 Divide through by 2:
y = 3/2 x + 2
Comparing this to the general form y = mx + c where m = the gradient we see that the gradient = 3/2.
b. When the line crosses the y-axis x = 0 so we have the equation:
2y = 3(0) + 4
2y = 4
y = 2.
So the required point is (0, 2).
Okay. The question is m/9 - 17 = 21. First off, we will add 17 to both sides. -17 + 17 cancels out. 21 + 17 is 38. That leaves m/9 = 38. Multiply each side by 9 to isolate the m, because m is the numerator and 9 is the denominator. m/9 * 9/1 cancels out. 38 * 9 is 342. Let's check this. 342/9 is 38. 38 - 17 is 21. 21 = 21. There. x = 342.